package com.ruoyi.web.controller.common;

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.hutool.core.lang.UUID;
import cn.hutool.json.JSONObject;
import com.alibaba.fastjson2.JSON;
import com.obs.services.ObsClient;
import com.obs.services.model.AccessControlList;
import com.obs.services.model.PutObjectRequest;
import com.ruoyi.common.enums.OBSUploadUrl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.framework.config.ServerConfig;

/**
 * 通用请求处理
 * 
 * @author ruoyi
 */
@RestController
@RequestMapping("/common")
public class CommonController
{
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    private static final String FILE_DELIMETER = ",";

    private static final String ENDPOINT = "https://obs.cn-east-3.myhuaweicloud.com";
    private static final String BUCKET_NAME = "bucket-lx";
    private static final String BASE_URL = "https://"+ BUCKET_NAME +".obs.cn-east-3.myhuaweicloud.com/";
    /**
     * 通用下载请求
     * 
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {
        try
        {
            if (!FileUtils.checkAllowDownload(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = RuoYiConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete)
            {
                FileUtils.deleteFile(filePath);
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception
    {
        try
        {
            // 上传文件的桶路径
            String fileName = UUID.randomUUID().toString() + "." + getFileExtension(file);
            String filePath = OBSUploadUrl.COMMON_FILE.getUrl();
            JSONObject OBSKey = getOBSKey();
            String ak = OBSKey.getStr("AK");
            String sk = OBSKey.getStr("SK");

            // 开始上传
            ObsClient obsClient = new ObsClient(ak, sk,ENDPOINT);
            PutObjectRequest request = new PutObjectRequest();
            request.setBucketName(BUCKET_NAME);
            request.setObjectKey(filePath + fileName);
            AccessControlList aclList = AccessControlList.REST_CANNED_PUBLIC_READ;
            request.setAcl(aclList);
            File multipartToFile = multipartToFile(file);
            request.setFile(multipartToFile);
            obsClient.putObject(request);
            System.out.println("上传文件成功");
            // 返回
            String url = BASE_URL + filePath + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", fileName);
            ajax.put("originalFilename", file.getOriginalFilename());
            // 删除临时文件
            multipartToFile.delete();
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files)
            {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        try
        {
            if (!FileUtils.checkAllowDownload(resource))
            {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = RuoYiConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    private JSONObject getOBSKey() {
        String filePath = new File("").getAbsolutePath() + "\\key.txt"; // 文件路径
        StringBuilder contentBuilder = new StringBuilder();
        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String str;
            while ((str = br.readLine()) != null) {
                contentBuilder.append(str);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        String jsonString = contentBuilder.toString();
        return new JSONObject(jsonString);
    }

    // 将Multipart转为File
    private File multipartToFile(MultipartFile multipart) throws IllegalStateException, IOException {
        File file = new File("",multipart.getOriginalFilename());

        try (InputStream inputStream = multipart.getInputStream();
             FileOutputStream outputStream = new FileOutputStream(file)) {
            // 将文件内容写入目标文件
            byte[] buffer = new byte[4096];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
        }

        return file;
    }

    public String getFileExtension(MultipartFile multipartFile) {
        String originalFilename = multipartFile.getOriginalFilename();
        if (originalFilename != null && originalFilename.contains(".")) {
            return originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
        }
        return "";
    }
}
